如何在无UI的Java类中不使用WebView加载URL？

No problem! Since you just need to send a registration token to your server without any UI display, here are a couple of straightforward, reliable approaches you can implement in your plain Java class:

This is Java's built-in solution, so you don't need to add any external dependencies. Perfect for simple requests like sending a token.

private void sendRegistrationToServer(String token) {
    // Always run network operations on a background thread (mandatory for Android)
    new Thread(() -> {
        HttpURLConnection urlConnection = null;

        try {
            // Construct the full request URL
            URL url = new URL("https://mywebsite.com/register.php?token=" + token);
            urlConnection = (HttpURLConnection) url.openConnection();
            urlConnection.setRequestMethod("GET");
            urlConnection.setConnectTimeout(5000); // 5-second connection timeout
            urlConnection.setReadTimeout(5000);    // 5-second read timeout

            // Check if the request was successful
            int responseCode = urlConnection.getResponseCode();
            if (responseCode == HttpURLConnection.HTTP_OK) {
                Log.d("Registration", "Token sent successfully!");
            } else {
                Log.e("Registration", "Failed to send token. Response code: " + responseCode);
            }

        } catch (MalformedURLException e) {
            Log.e("Registration", "Invalid URL format: " + e.getMessage());
        } catch (IOException e) {
            Log.e("Registration", "Network error occurred: " + e.getMessage());
        } finally {
            // Clean up resources
            if (urlConnection != null) {
                urlConnection.disconnect();
            }
        }
    }).start();
}

Key Notes: #

• Threading: Never run network calls on the main thread (Android will throw a NetworkOnMainThreadException). The example above uses a background thread for this.
• Permissions: Don't forget to add the internet permission to your AndroidManifest.xml:

  <uses-permission android:name="android.permission.INTERNET"/>
  

• Security Tip: If you want to avoid exposing the token in the URL, switch to a POST request and send the token in the request body instead.

OkHttp is a popular, robust network library that simplifies request handling and includes built-in threading support.

Step 1: Add Dependency #

First, add OkHttp to your project's build.gradle (Module level):

dependencies {
    implementation 'com.squareup.okhttp3:okhttp:4.12.0' // Use the latest version available
}

Step 2: Implement the Request #

private void sendRegistrationToServer(String token) {
    OkHttpClient client = new OkHttpClient.Builder()
            .connectTimeout(5, TimeUnit.SECONDS)
            .readTimeout(5, TimeUnit.SECONDS)
            .build();

    // Build a GET request
    Request request = new Request.Builder()
            .url("https://mywebsite.com/register.php?token=" + token)
            .build();

    // Execute the request asynchronously (OkHttp handles threading for you)
    client.newCall(request).enqueue(new Callback() {
        @Override
        public void onFailure(@NotNull Call call, @NotNull IOException e) {
            Log.e("Registration", "Failed to send token: " + e.getMessage());
        }

        @Override
        public void onResponse(@NotNull Call call, @NotNull Response response) throws IOException {
            try {
                if (response.isSuccessful()) {
                    Log.d("Registration", "Token sent successfully!");
                } else {
                    Log.e("Registration", "Failed to send token. Response code: " + response.code());
                }
            } finally {
                response.close(); // Always close the response body to free resources
            }
        }
    });
}

Bonus: Secure POST Request #

For better security, send the token in the request body instead of the URL:

// Replace the request builder with this for POST
RequestBody formBody = new FormBody.Builder()
        .add("token", token)
        .build();

Request request = new Request.Builder()
        .url("https://mywebsite.com/register.php")
        .post(formBody)
        .build();

• Avoid hardcoding URLs: Store them in a constants class or configuration file for easier maintenance.
• Handle errors gracefully: Instead of just logging exceptions, consider adding retry logic for transient network failures.
• Ensure HTTPS is used: Always use https:// to encrypt the token in transit and prevent interception.

内容的提问来源于stack exchange，提问作者Alp